Given the main method below and its output: public class TwoThreadsDemo { public

Question

Given the main method below and its output:

public class TwoThreadsDemo {
public static void main (String[] args) {
new SimpleThread("CECS 277").start();
new SimpleThread("OOP in Java").start();
}
}

Output

0 OOP in Java
0 CECS 277
1 OOP in Java
2 OOP in Java
1 CECS 277
3 OOP in Java
4 OOP in Java
2 CECS 277
5 OOP in Java
3 CECS 277
4 CECS 277
5 CECS 277
6 OOP in Java
6 CECS 277
7 OOP in Java
7 CECS 277
8 CECS 277
8 OOP in Java
9 CECS 277
DONE! CECS 277
9 OOP in Java
DONE! OOP in Java

Implement the class SimpleThread.

Explanation / Answer

Solution:

package com.chegg.nancy.solutions;

class SimpleThread extends Thread {
   private Thread t;
   private String threadName;
   int i = 0;

   SimpleThread(String name) {
       threadName = name;
       System.out.println(i++ + " " + threadName);
   }

   public void run() {
       System.out.println(i++ + " " + threadName);
       try {
           while (i <= 9) {
               System.out.println(i++ + " " + threadName);
               // Let the thread sleep for a while.
               Thread.sleep(50);
           }
       } catch (InterruptedException e) {
           System.out.println("Thread " + threadName + " interrupted.");
       }
       System.out.println("DONE!" + threadName);
   }

   public void start() {
       System.out.println(i++ + " " + threadName);
       if (t == null) {
           t = new Thread(this, threadName);
           t.start();
       }
   }

}

public class TwoThreadsDemo {
   public static void main(String[] args) {
       new SimpleThread("CECS 277").start();
       new SimpleThread("OOP in Java").start();
   }
}

Important: One can not imagine the order of threds execution.That is totally unpredictable.

Output:

0 CECS 277
1 CECS 277
0 OOP in Java
1 OOP in Java
2 CECS 277
3 CECS 277
2 OOP in Java
3 OOP in Java
4 CECS 277
4 OOP in Java
5 CECS 277
5 OOP in Java
6 CECS 277
6 OOP in Java
7 CECS 277
7 OOP in Java
8 CECS 277
8 OOP in Java
9 CECS 277
9 OOP in Java
DONE!CECS 277
DONE!OOP in Java

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